/* Ảnh vuông mặc định cho khung xem trước Facebook; giữ trọn nội dung khi khung thay đổi. */
body[data-route="content"] #page-body .content-v140 #publish-preview .content-preview-art {
  background-image:url('/assets/botviet-content-v95-facebook-cover.png?v=9.5.0')!important;
  background-size:contain!important;
  background-position:center!important;
  background-repeat:no-repeat!important;
  background-color:#09204d!important;
}